CVE-2024-4778Network attack vector

Arbitrary code execution via memory corruption

Published May 14, 2024 · Updated Aug 1, 2024

Memory safety flaws in Mozilla Firefox before 126 allow remote attackers to execute arbitrary code via unspecified vectors. Mozilla observed memory corruption across multiple Firefox 125 bugs but has not disclosed the affected components or erroneous operations. No authentication is required, and successful exploitation executes code in the browser context; the precise trigger conditions remain undisclosed.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory safety flaws in Mozilla Firefox before 126 allow remote attackers to execute arbitrary code via unspecified vectors. Mozilla observed memory corruption across multiple Firefox 125 bugs but has not disclosed the affected components or erroneous operations. No authentication is required, and successful exploitation executes code in the browser context; the precise trigger conditions remain undisclosed.

The record

CVE
CVE-2024-4778
Published
May 14, 2024
Updated
Aug 1, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1260, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <126
  2. Affected versionversion=unspecified <126

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <126; version=unspecified <126

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1260Improper Handling of Overlap Between Protected Memory Ranges
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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